[robinsons]

preflop: without a read, I'm probably folding this without a read on the opponent. I do not play 20/40 so cannot comment on players there, but unless you have a good deal of fold equity I don't like it OOP. After the 3bet, I don't see what the benefit of the cap is - at best you're putting in money 50/50 without position.
Flop - a good probabilty that this hasn't hit him, however he is going to call with overcards.
Turn - again a good chance you are still best here, however without a read his raise makes me fell uncomforatable but there's still a good enough chance that he's getting agro with overs to call down. Is the 3bet meant to try and fold a better hand, or for value? This is a play that I'd never make (judging by what I have seen from your past posts, you are a far better player than I), however I'd be interested in your reasoning here.
river - see above.